What is a Lubricant?
A Lubricant can be anything, which controls the friction forces between two surfaces. A lubricant, depending upon the necessity and design can, either reduce or increase or control the friction. It is also used as a sealing medium, cooling medium and cleansing medium, depending upon applications and design. A lubricant can be liquid, semi- liquid or solid. Grease falls under the semi-liquid category. Solid lubricants can be made mostly of plastics, especially PVC and Teflon. Normally, a lubricant means liquid lubricant.
